JSON字符串转换成List对象集合

前两天被一个很没意思的问题给难住了，看来最近没有复习巩固，有些知识都忘了怎么运用了。

简单说下：

有一个json字符串，我想通过jackson把json字符串转换成list对象集合，网上找了很多，但都不尽人意。后来还是看jackson文档，才知道怎么做。

需要的包：

<dependency><groupId>org.codehaus.jackson</groupId><artifactId>jackson-mapper-asl</artifactId><version>1.9.9</version></dependency>

要转换的json字符串：

[{"id":"36CD0224C1ED25F5E0538A3B0B7A8190","catgId":null,"matcAmont":50000,"lendPoolId":"36CD0224C1C225F5E0538A3B0B7A8190","balance":50000,"matchFlag":1,"isLock":1,"createTime":1467576000000,"userId":0,"mltCustLendPool":{"id":"36CD0224C1C225F5E0538A3B0B7A8190","userId":157020,"state":1,"isLock":1,"balance":50000,"curTotaAmt":50000,"syncDate":1467561600000,"inviFlag":2,"investTime":1467595065000,"deadline":1499131065000,"billDate":1467681465000,"billDay":5,"productId":"6","productName":"xxx","investAmt":50000,"prodOrderId":38662,"userTelephone":"15922166933","userName":"张三","idcardNum":"1111111111111","projectNum":null,"matchModelCode":null,"creditProduct":{"id":"290AA19B1134838EE053A716C0769130","swldid":"6","prodName":"xxx","prodType":null,"prodRate":0.13,"synFeeRate":null,"payCapitalType":null,"freezeTime":12,"prodCode":6,"prodCatgory":1,"unit":1},"subject":null},"orderFlag":null,"subject":0,"projectNum":null,"matchModeCode":"1"},{"id":"36DA5B50E54E2790E0538A3B0B7A2261","catgId":null,"matcAmont":50000,"lendPoolId":"36CD0224C1C225F5E0538A3B0B7A8190","balance":50000,"matchFlag":1,"isLock":1,"createTime":1467748800000,"userId":0,"mltCustLendPool":{"id":"36CD0224C1C225F5E0538A3B0B7A8190","userId":157020,"state":1,"isLock":1,"balance":50000,"curTotaAmt":50000,"syncDate":1467561600000,"inviFlag":2,"investTime":1467595065000,"deadline":1499131065000,"billDate":1467681465000,"billDay":5,"productId":"6","productName":"xxx","investAmt":50000,"prodOrderId":38662,"userTelephone":"15922166933","userName":"王dd","idcardNum":"2222222222222","projectNum":null,"matchModelCode":null,"creditProduct":{"id":"290AA19B1134838EE053A716C0769130","swldid":"6","prodName":"dfdfd","prodType":null,"prodRate":0.13,"synFeeRate":null,"payCapitalType":null,"freezeTime":12,"prodCode":6,"prodCatgory":1,"unit":1},"subject":null},"orderFlag":null,"subject":0,"projectNum":null,"matchModeCode":"1"}]

这个字符串的基本格式是数组型，也就是[{},{},{},{}]这种格式。

主要实现的代码不超过三行：

ObjectMapper mapper = new ObjectMapper();//定义 org.codehaus.jackson//MltWaitLendReco 是你要转换的beanList<MltWaitLendReco> lendReco =mapper.readValue(listStr,new TypeReference<List<MltWaitLendReco>>() { });//new TypeReference<List<MltWaitLendReco>>() { }写法很重要，写成List.class是不行的System.out.println(lendReco.get(0).getId());

顺便把引入的类给写下：

import org.codehaus.jackson.type.TypeReference;import org.codehaus.jackson.map.ObjectMapper;

其实这类json之间的转换工作中用到的很多，但没有总结过。还是有必要写个相关的工具类，总结下的。

为啥这么简单想不到呢？